get_arg_type
struct symbol *get_arg_type(struct expression *fn, int arg);
compare_type = get_arg_type(expr->fn, param);
type = get_arg_type(expr->fn, i);
type = get_arg_type(expr, param);
compare_type = get_arg_type(expr->fn, param);
compare_type = get_arg_type(expr->fn, param);
type = get_arg_type(expr->fn, i);
type = get_arg_type(call->fn, param);
arg_type = get_arg_type(expr->fn, i);
return get_arg_type(fn, param);
type = get_arg_type(fn, param);